Operators have requirements on the number of calls per day. Generally, more than 200 calls are made every day. But I don't know what you want. Adults will suffer from ear discomfort if they keep answering the phone for more than 30 minutes. The longer the time, the greater the damage to the brain. So many call centers use headphones to dial, just to reduce injuries. But the real estate should be dialed by landline. You can try, but you can't change it any more.
If you must do a part-time job, you can choose the sales category and exercise yourself more.